Jilly can't believe what she's seeing when she wakes up one day to find all the mice in her small town of Buffalo Bottom have gone strangely still. Things only get weirder, though, when the town is suddenly visited by a flying saucer -- full of alien cats! These felines say they come in peace, to help rid Buffalo Bottom of its mouse problem. But when the town's cows start disappearing mysteriously, Jilly suspects the visitors may be up to no good.